Abstract
Direct measurements of eddy diffusivities for momentum K m and heat K h by Doppler radar and by a radio acoustic sounding system in the upper troposphere and lower stratosphere were used to examine the applicability of three Reynolds-averaged Navier-Stokes (RANS) schemes of stratified turbulence in the environment: the E — ɛ turbulence scheme modified for stratified flows, the algebraic two-parameter E — ɛ Reynolds-stress scheme, and the three-parameter \(E - \varepsilon - \overline {\theta ^2 } \) turbulence scheme. All turbulence parameters-the turbulent kinetic energy (E), the dissipation rate (ɛ), and vertical profiles of potential temperature (atmospheric stability) and mean wind velocity-were derived from direct measurements for all three turbulence schemes. It is shown that the profile of the vertical diffusivity of momentum (K m ) obtained from the three-parameter RANS turbulence scheme agrees well with its directly measured analog. The profile of K m calculated by the two-parameter turbulence schemes fits measurements rather qualitatively.
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Original Russian Text © A.F. Kurbatskii, L.I. Kurbatskaya, 2014, published in Izvestiya AN. Fizika Atmosfery i Okeana, 2014, Vol. 50, No. 4, pp. 420–429.
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Kurbatskii, A.F., Kurbatskaya, L.I. Modeling the eddy transport of momentum and heat: Comparison with direct measurements in free atmosphere. Izv. Atmos. Ocean. Phys. 50, 369–376 (2014). https://doi.org/10.1134/S0001433814040161
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DOI: https://doi.org/10.1134/S0001433814040161